Accession Number : ADA299173

Title :   Eaton Throat-Valve Element Modifications Preliminary Report.

Descriptive Note : Final rept. Jul-Dec 93,

Corporate Author : IDAHO NATIONAL ENGINEERING LAB IDAHO FALLS

Personal Author(s) : Stacey, Marcela R. ; Arendts, James G. ; Berry, Ray A. ; Korth, Gary E. ; Schwieder, Paul R.

PDF Url : ADA299173

Report Date : JUL 1995

Pagination or Media Count : 244

Abstract : This report documents the development and findings of a computer model that simulates the behavior of the Eaton-Throat Valve Element (ETVE) prototype, and describes a proposed modification concept for the ETVE. This high speed valve was designed for the U.S. Army Research Laboratory, Aberdeen Proving Ground, MD, to control the simulation of the dynamic effects of a nuclear blast. The computer model reveals three main findings: (1) the ETVE chatters during the open cycle, (2) the chatter is caused by the high gas forces on the sliding sleeve as the driver gas passes through its portholes, and (3) the chatter is aggravated because there is insufficient damping in the system. The INEL recommends opening the ETVE by sliding the sleeve toward the downstream end of the valve instead of toward the upstream end, as the ETVE is presently configured, and to provide additional damping to the system. However, neither of these configuration changes can be achieved easily, and a redesign and analysis of the ETVE must be completed prior to performing any work on the current ETVE prototype. The ETVE simulation model proved to be an extremely valuable tool in analyzing the qualitative nature of the valve's operation. Further development of the model is recommended for quantitative analysis and design of the ETVE. This report explains the model and stress analysis findings, and proposes a redesign concept.

Descriptors :   *STRESS ANALYSIS, *SHOCK TUBES, *SLEEVE VALVES, COMPUTERIZED SIMULATION, QUANTITATIVE ANALYSIS, MODIFICATION, DAMPING, NUCLEAR EXPLOSION SIMULATION, CONFIGURATIONS, BLAST LOADS, SLIDING.

Subject Categories : Test Facilities, Equipment and Methods
      Explosions

Distribution Statement : APPROVED FOR PUBLIC RELEASE